title: Direct observation of lithium staging in partially delithiated LiFePO4 at atomic resolution.
abstract: Lithium ions in LiFePO(4) were observed directly at atomic resolution by an aberration-corrected annular-bright-field scanning transmission electron microscopy technique. In addition, it was found in partially delithiated LiFePO(4) that the remaining lithium ions preferably occupy every second layer, along the b axis, analogously to the staging phenomenon observed in some layered intercalation compounds. This new finding challenges previously proposed LiFePO(4)/FePO(4) two-phase separation mechanisms.
authors.affiliation: WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980 8577, Japan. gu@wpi-aimr.tohoku.ac.jp
authors.forename: Lin
authors.initials: L
authors.lastname: Gu
authors.forename: Changbao
authors.initials: C
authors.lastname: Zhu
authors.forename: Hong
authors.initials: H
authors.lastname: Li
authors.forename: Yan
authors.initials: Y
authors.lastname: Yu
authors.forename: Chilin
authors.initials: C
authors.lastname: Li
authors.forename: Susumu
authors.initials: S
authors.lastname: Tsukimoto
authors.forename: Joachim
authors.initials: J
authors.lastname: Maier
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Ikuhara